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Regional Basic Professional Training Course in Korea

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<strong>Regional</strong> <strong>Basic</strong> <strong>Professional</strong> <strong>Tra<strong>in</strong><strong>in</strong>g</strong> <strong>Course</strong> (BPTC) on Nuclear Safety<br />

FIG. 4.9. Core Structure of OSIRIS Reactor<br />

The concrete of the pool and the sta<strong>in</strong>less steel l<strong>in</strong>er were designed to resist a BORAX‐<br />

type reactivity accident of an explosive nature. The test carried out showed, even if the<br />

concrete cracks, the sta<strong>in</strong>less steel l<strong>in</strong>er resists and rema<strong>in</strong>s leaktight.<br />

4.2.3.5. Cool<strong>in</strong>g systems<br />

Primary coolant system<br />

When operat<strong>in</strong>g <strong>in</strong> nom<strong>in</strong>al regime, the heat released by the reactor core is removed by a<br />

5450 m 3 /h flowrate of deionized light water which enters at the base of the core structure,<br />

flows upwards through the core and is then channelled to the decay tank. The primary<br />

coolant system pumps (three pumps <strong>in</strong> service and one <strong>in</strong> reserve) channel the water <strong>in</strong>to<br />

a common header from which it is distributed <strong>in</strong>to the four heat exchangers. At the outlet<br />

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